Do your child's Lego minifigures miss out on all the fun? Well I've got a solution for you!

Carriage is compatible with Thomas and Friends engines and most wooden railway tracks. The hook is specific to Thomas and friends. I might make one to accept a magnet for Brio if there’s any interest.

Lego minifigures sit in removable Lego style chairs.

I printed with PLA+ 100% infill, 0.12mm layer height.
the hook I printed the same but with PETG
The carriage needs a bit of weight to stay on the track hence the solid printing.

Supports need to be painted on the front and rear of the carriage under the couplings as pictured. The roof needs to be printed standing up with supports and a brim. Everywhere else, supports aren't needed.

The wheels and hook are attached with M2x8mm Socket Head bolts (7 total). It's important to use socket heads as they form the bearings for the wheels.
They won't screw in all the way - this is intentional so the wheels have a bit of sideways play otherwise the carriage won't go around corners. Be careful not to strip them.

Update 15/09/2023 - Replaced the .3mf file as I noticed I'd missed a support